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19 November 1998 PTB radiometry laboratory at the BESSY II electron storage ring
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The Physikalisch-Technische Bundesanstalt (PTB), Germany's national metrology institute, has been operating a radiometry laboratory at the BESSY I 800 MeV electron storage ring since 1982. The BESSY I electron storage ring is optimized for radiometry and is used as a primary source standard with calculable spectral photon flux with relative uncertainties below 0.4 percent. A cryogenic electrical- substitution radiometer is used as a primary detector standard with a relative uncertainty in the determination of the radiant power of about 0.2 percent. Various experimental stations allow for the use of undispersed, calculable synchrotron radiation from bending magnets up to a photon energy of 15 keV and of monochromatorized synchrotron radiation in the 3 eV to 1500 eV spectral range, respectively. Major activities comprise the calibration of radiation detectors rand radiation sources as well as the characterization of optical components in the VUV and soft x-ray spectral range with low uncertainty. Among radiometric calibrations for different applications, extended work has been performed for solar and astronomical missions like SOHO, AXAF and XMM.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gerhard Ulm, Burkhard Beckhoff, Roman Klein, Michael K. Krumrey, Hans Rabus, and R. Thornagel "PTB radiometry laboratory at the BESSY II electron storage ring", Proc. SPIE 3444, X-Ray Optics, Instruments, and Missions, (19 November 1998);


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